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DuraAce 7800 Rear Hub - Which Cassettes?

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DuraAce 7800 Rear Hub - Which Cassettes?

Old 03-28-07, 11:24 AM
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lordconqueror
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DuraAce 7800 Rear Hub - Which Cassettes?

Since the 7800 has an aluminum freehub body, which 10 speed cassettes on the market can I use? I have seen some SRAM cassettes marked as incompatible with these systems, but no other cassettes I have looked at on eBay even mention anythign like this. This means I need to look for cassettes with alloy carriers, right? Or am I messing this up?
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Old 03-28-07, 11:52 AM
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Shimano 10 speed.
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Old 03-28-07, 12:11 PM
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Including 105 and Ultegra?
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Old 03-28-07, 12:41 PM
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Alloy freehubs are problematic in that you'll always have some marring and embedding of cassette cogs into the aluminum. I don't know what Shimano does to help alleviate this problem.

American Classic uses Shimano compatible alloy freehubs as well. They supply clips to use with the cassette to aid in minimizing the embedding problem. These clips look like this:

<- The clip is the darker object between the cog and freehub body.

I believe you can get these clips from American Classic. They have three sets: 105, Ultegra, DuraAce

American Classic is found here: http://www.amclassic.com
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Old 03-28-07, 12:42 PM
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Originally Posted by lordconqueror
Including 105 and Ultegra?
Yup.
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Old 03-28-07, 01:22 PM
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Originally Posted by lordconqueror
Including 105 and Ultegra?
Yup, the Shimano 10-spd has taller splines on the freehub body to give more engagement surface area to prevent this:



The Shimano 10-spd cogs have deeper valleys to match the taller splines on the body. The 9-spd cogs won't fit on the 10-spd freehub bodies. :



You'll notice that the Shimano cogs have matching teeth for every spline, thus more engagement points to spread out the load. The AmClassic has only a few teeth, and thus needs the extra clips to engage the other splines on the freehub body.

Reference: http://sheldonbrown.com/dura-ace.html
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Old 03-28-07, 01:57 PM
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Originally Posted by DannoXYZ
Yup, the Shimano 10-spd has taller splines on the freehub body to give more engagement surface area to prevent this:



The Shimano 10-spd cogs have deeper valleys to match the taller splines on the body. The 9-spd cogs won't fit on the 10-spd freehub bodies. :



You'll notice that the Shimano cogs have matching teeth for every spline, thus more engagement points to spread out the load. The AmClassic has only a few teeth, and thus needs the extra clips to engage the other splines on the freehub body.

Reference: http://sheldonbrown.com/dura-ace.html

Good post.

One note: only the Dura Ace 10 speed hub has the taller splines. Ultegra/105 10 speed hubs can take any cassette from 8 speed onward.
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